Wh to mAh Conversion Calculator

Wh to mAh Calculator

Wh to mAh Conversion Calculator – Convert Energy to Battery Capacity

A Wh to mAh Conversion Calculator is a valuable tool for anyone working with batteries, portable devices, or renewable energy systems. It allows you to convert watt-hours (Wh), a measure of energy, into milliampere-hours (mAh), a common measure of battery capacity.

This conversion is essential when comparing batteries, planning battery-powered projects, or estimating how long a device will run.

Understanding Wh and mAh

What Are Watt-Hours (Wh)?

Watt-hours measure energy. They tell you how much total power a battery or device can provide over time.

$$
1 Wh = 1 W × 1 hour
$$
  • Example: A 50 Wh battery can supply 50 watts for 1 hour, or 25 watts for 2 hours.

What Are Milliampere-Hours (mAh)?

mAh measures electric charge capacity, indicating how much current a battery can supply over time.

  • Example: A 2000 mAh battery can supply 2000 milliamps for 1 hour, or 1000 milliamps for 2 hours.

mAh is commonly used for:

  • Smartphones
  • Laptops
  • Tablets
  • Power banks

Wh to mAh Conversion Formula

The formula to convert watt-hours to milliampere-hours depends on battery voltage (V):

$$
mAh = \frac{Wh × 1000}{V}
$$

Where:

  • Wh = energy in watt-hours
  • V = voltage of the battery
  • 1000 converts ampere-hours (Ah) to milliampere-hours (mAh)

Step-by-Step Examples

Example 1: 10 Wh Battery at 5V

$$
mAh = \frac{10 × 1000}{5} = 2000 mAh
$$

Result: 2000 mAh

Example 2: 50 Wh Battery at 12V

$$
mAh = \frac{50 × 1000}{12} ≈ 4166.7 mAh
$$

Example 3: 100 Wh Battery at 3.7V

$$
mAh = \frac{100 × 1000}{3.7} ≈ 27,027 mAh
$$

How the Wh to mAh Calculator Works

  1. Enter battery energy in watt-hours (Wh)
  2. Enter battery voltage (V)
  3. Click Calculate
  4. Get battery capacity in mAh instantly

Some calculators also allow:

  • Reverse calculation: mAh to Wh
  • Batch calculations for multiple batteries
  • Integration with solar or portable power setups

Practical Applications

  • Battery Selection: Match your device requirements with available batteries
  • Portable Device Planning: Estimate runtime based on energy usage
  • Solar Projects: Determine battery capacity needed to store energy
  • Electronics Design: Calculate battery sizing for custom circuits

Quick Reference Table

Energy (Wh) Voltage (V) Capacity (mAh)
10 Wh 5 V 2000 mAh
20 Wh 3.7 V 5405 mAh
50 Wh 12 V 4167 mAh
100 Wh 3.7 V 27,027 mAh

Frequently Asked Questions

Can I convert Wh to mAh without knowing the voltage?

No. Voltage is essential because mAh depends on both energy and battery voltage.

How do I calculate device runtime from Wh or mAh?

$$
\text{Runtime (h)} = \frac{\text{Battery capacity (Wh)}}{\text{Device power (W)}}
$$

or

$$
\text{Runtime (h)} = \frac{\text{Battery capacity (mAh)} × V}{1000 × \text{Device power (W)}}
$$

Is mAh the same as Wh?

No. mAh measures charge capacity, Wh measures energy. Voltage connects the two.

Final Thoughts

A Wh to mAh Conversion Calculator is a simple yet powerful tool for:

  • Comparing batteries
  • Planning portable power systems
  • Estimating device runtime
  • Designing electronic circuits

By converting Wh to mAh, you can choose the right battery for your device and avoid over- or under-sizing your energy storage solution.

This calculator pairs perfectly with:

  • mAh to Wh Converter
  • Battery Runtime Calculator
  • Solar Battery Sizing Calculator
  • Energy Consumption Calculator

Understanding this conversion ensures your devices and projects are efficient, reliable, and well-powered.